A kind of preparation method of normal temperature regeneration anti-cracking waste asphalt mixture

Abstract

The invention discloses a preparation method of normal temperature regeneration and crack-resistant waste asphalt mixture. The plasticizer epoxidized soybean oil, the petroleum resin and the modifier maleic anhydride are stirred at 95-105 DEG C to make them evenly mixed to obtain a polymer oil ; Under the condition of 80~100 ℃, the polymer oil is rapidly mixed and mixed with 80~100 parts by weight and 1~20 parts by weight of active toughening agent on a shearing machine to obtain high-toughness filled polymer oil; The polymerized oil is cooled to 30-40°C, and the aqueous solution of the surfactant vinyl triethoxysilane is added, stirred and mixed evenly, and maintained to obtain an anti-cracking regenerant at room temperature. The normal temperature anti-cracking rejuvenating agent can not only fully activate the aged asphalt, but also improve the anti-cracking ability and water damage resistance of the cold recycled asphalt mixture together with the interface-enhancing emulsified asphalt and the pre-hydrated cement. The invention can make the anti-cracking performance and anti-water damage performance of the recycled waste asphalt mixture better than the conventional recycled asphalt pavement.

Description

technical field [0001] The invention belongs to the technical field of normal temperature regenerated crack-resistant waste asphalt mixture and cold regenerated asphalt mixture, and particularly relates to a normal temperature regenerated crack-resistant waste asphalt mixture and a preparation method thereof. Background technique [0002] During the renovation of highway asphalt pavement, a huge amount of waste asphalt mixture will be produced. The main treatment method is hot regeneration or cold regeneration. The above treatment methods often have problems such as insufficient asphalt regeneration and low performance of recycled mixture. Therefore, how to effectively utilize the old asphalt in the waste asphalt mixture is an important key technology. [0003] During the use of asphalt mixture pavement, due to the physical or chemical effects of the external environment, the asphalt will age, and the chemical composition or mechanical properties of the asphalt will change t...

AI Technical Summary

Problems solved by technology

The technical principle of this commonly used rejuvenator is to reduce the viscosity of old asphalt, and its negative effects lead to a sharp decline in the adhesion and cohesion of asphalt, and under high temperature conditions, it will lead to a serious decline in the deformation resistance of the mixture

For example, Patent No. FR2976288B1 discloses a regenerated binder (an organic combination of regenerated agent and binder-asphalt), which can better plastically regenerate old asphalt, but the regenerated binder has certain Application limitations, this patent is applicable to the residual binder content of asphalt aggregate between 3.5% and 5.5%, that is, the content of old asphalt in waste asphalt mixture is between 3.5% and 5.5%

This shows that when the old asphalt content in the waste asphalt mixture is less than 3.5%, the performance of the mixture is insufficient, especially its cracking resistance and The ability to resist water damage needs to be improved

When the old asphalt content in the waste asphalt mixture is greater than 5.5%, since the mixture itself contains a high amount of old asphalt, if the recycled binder is added, the effective bonding component will increase, resulting in the performance of the mixture being "soft" ( lead to a decrease in the anti-rutting ability), and at the same time, the road surface is prone to oil flooding in the later stage (resulting in a decrease in the anti-skid ability of the road surface)

To sum up, the cracking resistance, water damage resistance and high temperature deformation resistance of the recycled binder recycled asphalt mixture are insufficient, and need to be further improved

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